Product parameterOrdinary 2015 button double battery with 2 pcs. You can buy it at any store. Battery life: 72 hours of continuous light. (This product is not equipped with batteries)We will do our best to add a different color to your life! ——DUTUIAfter-sales service:100% satisfaction promise, any product quality problems will be replaced or a full refund, please feel free to contact us by email, your inquiry will be answered within 24 hours, giving you a satisfactory shopping experience.